/******************************************************************************************** * drivers/input/max11802.h * * Copyright (C) 2011-2012, 2014 Gregory Nutt. All rights reserved. * Authors: Gregory Nutt * Petteri Aimonen * * References: * "Low-Power, Ultra-Small Resistive Touch-Screen Controllers * with I2C/SPI Interface" Maxim IC, Rev 3, 10/2010 * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ********************************************************************************************/ #ifndef __DRIVERS_INPUT_MAX11802_H #define __DRIVERS_INPUT_MAX11802_H /******************************************************************************************** * Included Files ********************************************************************************************/ #include #include #include #include #include #include #include #include #include /******************************************************************************************** * Pre-processor Definitions ********************************************************************************************/ /* MAX11802 Interfaces *********************************************************************/ /* LSB of register addresses specifies read (1) or write (0). */ #define MAX11802_CMD_XPOSITION ((0x52 << 1) | 1) #define MAX11802_CMD_YPOSITION ((0x54 << 1) | 1) #define MAX11802_CMD_MEASUREXY (0x70 << 1) #define MAX11802_CMD_MODE_WR (0x0B << 1) #define MAX11802_CMD_MODE_RD ((0x0B << 1) | 1) #define MAX11802_CMD_AVG_WR (0x03 << 1) #define MAX11802_CMD_SAMPLE_WR (0x04 << 1) #define MAX11802_CMD_TIMING_WR (0x05 << 1) #define MAX11802_CMD_DELAY_WR (0x06 << 1) #define MAX11802_CMD_PULL_WR (0x07 << 1) /* Register values to set */ #define MAX11802_MODE 0x06 #define MAX11802_AVG 0x55 #define MAX11802_SAMPLE 0xAA #define MAX11802_TIMING 0x77 #define MAX11802_DELAY 0x55 #define MAX11802_PULL 0x33 /* Driver support **************************************************************************/ /* This format is used to construct the /dev/input[n] device driver path. It * defined here so that it will be used consistently in all places. */ #define DEV_FORMAT "/dev/input%d" #define DEV_NAMELEN 16 /* Poll the pen position while the pen is down at this rate (50MS): */ #define MAX11802_WDOG_DELAY MSEC2TICK(50) /******************************************************************************************** * Public Types ********************************************************************************************/ /* This describes the state of one contact */ enum max11802_contact_3 { CONTACT_NONE = 0, /* No contact */ CONTACT_DOWN, /* First contact */ CONTACT_MOVE, /* Same contact, possibly different position */ CONTACT_UP, /* Contact lost */ }; /* This structure describes the results of one MAX11802 sample */ struct max11802_sample_s { uint8_t id; /* Sampled touch point ID */ uint8_t contact; /* Contact state (see enum ads7843e_contact_e) */ bool valid; /* True: x,y contain valid, sampled data */ uint16_t x; /* Measured X position */ uint16_t y; /* Measured Y position */ }; /* This structure describes the state of one MAX11802 driver instance */ struct max11802_dev_s { #ifdef CONFIG_ADS7843E_MULTIPLE FAR struct ads7843e_dev_s *flink; /* Supports a singly linked list of drivers */ #endif uint8_t nwaiters; /* Number of threads waiting for MAX11802 data */ uint8_t id; /* Current touch point ID */ volatile bool penchange; /* An unreported event is buffered */ uint16_t threshx; /* Thresholding X value */ uint16_t threshy; /* Thresholding Y value */ sem_t devsem; /* Manages exclusive access to this structure */ sem_t waitsem; /* Used to wait for the availability of data */ FAR struct max11802_config_s *config; /* Board configuration data */ FAR struct spi_dev_s *spi; /* Saved SPI driver instance */ struct work_s work; /* Supports the interrupt handling "bottom half" */ struct max11802_sample_s sample; /* Last sampled touch point data */ WDOG_ID wdog; /* Poll the position while the pen is down */ /* The following is a list if poll structures of threads waiting for * driver events. The 'struct pollfd' reference for each open is also * retained in the f_priv field of the 'struct file'. */ struct pollfd *fds[CONFIG_MAX11802_NPOLLWAITERS]; }; /******************************************************************************************** * Public Function Prototypes ********************************************************************************************/ #ifdef __cplusplus #define EXTERN extern "C" extern "C" { #else #define EXTERN extern #endif #undef EXTERN #ifdef __cplusplus } #endif #endif /* __DRIVERS_INPUT_ADS7843E_H */